Guide mechanism for power-driven hand held circular saws



GUIDE MECHANISM FOR POWER-DRIVEN HAND HELD CIRCULAR SAWS 2 Sheets-Sheet 1 Filed Dec. 5, 1952 R E m x Ms K R m m F MJZXW/ y 4, 1954 F. R. GETSINGER ,67 99 DRIVEN HAND HELD CIRCULAR SAWS GUIDE MECHANISM FOR POWER- Filed Dec. 5, 1952 2 Sheets-Sheet 2 Patented May 4, 1954 UNITED STATES PATENT OFFICE GUIDE MECHANISM FOR POWER-DRIVEN HAND HELD CIRCULAR SAWS 3 Claims.

This invention concerns guide mechanism for power driven hand held circular saws.

With the advent of power driven hand held circular saws it became quickly evident to those familiar with their use that it was desirable to provide means for guiding the saw thru the work by mechanical means. In keeping with this idea it was also thought desirable to guide the saw at various angles with reference to the work for many purposes. Many devices have been suggested but each has had the common fault that there was no adequate provision for attaching the saw frame shoe to the guide, and for maintaining it in a safe condition relative to the Work. Furthermore, there have been no adaptations of such devices which may be used with the saw cutting-segment directed downward, so as to maintain the inherent safety features of the saw frame and blade guards.

In view of the foregoing, one of the objects of my invention is to provide a guide for the shoes of power driven hand saws which will enable the saw to be moved freely in a predetermined direction, and which will hold the saw from dislodgment during the sawing operation, and which will enable the user to remove it from the guide rail easily and quickly, when desired.

Another object concerns the provision of a circular hand saw, driven by an electric motor, which has a detachable guide plate adapted to run on a slide which may be clamped on an object to be sawed, such as a door, so that the user may run the saw along the guide and take a cut of predetermined thickness and uniform width which is determined by the position of said guide;

Another object is to provide a table with a guide, or guide rail, extending along one edge of the top, so that the saw may be made to traverse the width of the table adjacent this edge, while a support beneath the table holds objects to be sawed, such as boards or the like, up against the under side of the table top and a backing piece beneath the top which acts as a stop; said backing piece being hinged at one end and removably clamped at the other end so that the object being sawed may be held at various angles relative to the guide.

Other objects will appear hereinafter.

I attain the foregoing objects by means of the devices, parts, and combinations of parts shown in the accompanying drawings in which- Figure 1 is a perspective view of my guide plate in expanded relation to a power driven handfsaw, showing the means of attachment; also the relation of the guide plate to a guide rail;

Figure 2 is a perspective view of a saw provided with the guide plate, here concerned, and applied to a guide rail attached to a door'and drawn on a somewhat reduced scale;

' Figure 3 is an end view of the saw frame, guide plate in place on the saw frame, and inserted in working position on a rail attached to said door.

Figure 4 is a perspective view of the saw and guide members with the rail attached to a table beneath the top of which lumber is held to be sawed;

Figure 5 is a plan view of said saw and and Figure 6 is a sectional elevational View thereof taken substantially on line 66 of Figure 4.

Similar numerals refer to similar parts in the several views.

Referring to the drawings, 2 indicates the saw frame whereon the circular saw blade 3 is mounted and driven by electric motor 4. This frame has a handle 5 by which the user directs the saw and a shoe 6 to support the weight of the saw frame as it is moved over the surfaces of objects being sawed. A saw guard I is pivotally attached to the under side of shoe 6 to enclose the lower, or cutting, segment of the saw blade, and a stationary guard 8 is rigidly attached to frame 2 and encloses the upper portion of th saw.

On the bottom of the frame 2 there is a base plate It] to which shoe 6 is hinged on pins l2. This enables the user to tilt the entire saw body relative to the shoe in orderto make angle cuts. A slotted brace M held by a thumb nut and bolt [5 will hold the body 2 at any angle desired with reference to shoe 6 to vary the depth of cut of saw 3. g

To the front and rear edges l6 and I1, respectively, of shoe 6, and near its inner edge Hi, there are two upwardly extending lugs 20 and 2|. These have holes E9 to receive bolts 22 which have thumb nuts 23. A guide plate 24 has flanges 25 at its fore and rear edges which extend beyond its inner edge 26 a distance sufficient to overlap the outside faces of lugs 20 and 2|. These outwardly extending flanges are provided with holes 29 which mate holes I 9 on lugs 26 and 2 i Rabbet grooves so form shoulders against which the lower edges 3| of flanges 26 rest providing firm attaching joints between these parts when bolts 22 and nuts 23 are tightened.

Along the outer edge of guide plate 24 there is an upturned guide fiange 32 which slidably engagesthe downwardly opening groove 33 of guide rail 34.

Guide rail 34 has a substantially vertical outer table;

plate 35 along the upper edge of which groove 33 is formed by top strip 36, and an outer strip 31. Plate 35 is joined along its bottom edge to substantially horizontal base plate 38. This base plate has holes 39 to receive securing screws or other suitable attaching means, such as clamps 40.

The guide rail 34 may be made in one continuous-piece, as shown in Figures exand 5, Min jointed-sections 34:1, 34b, and 340, which are joined by bolts 42, as shown in Figure 2.

The guide rail 34 may be clamped to a doorM, as shown in Figure 2, so that .thesaw. guideaplate 24, shoe 6, and frame 2 will be guided 'alo-ng edge 45. By this means a strip may be cut from the door which will accurately follow a pred'etermined line, at any desired angle, as. entrolled.by..the guide rail. A length of lumber may, obviously, be substituted for the door 44 and ripping cutsrt'aken along its edges. For cross-cuts the rail 34 is at- .riachedrto the ttepy lfij of..table 47, lifiguresreito 6,

near .its right hand edge. .Thesaw frame 2;.may

-.thenbe runwalong the 'railwith the blade extending below the .topsurf-ace ottabletop dfih Lumber da maybeinserted under table top 46,.and-supported-on underrails 50;.and' held againsta backing-piece l--which-forms a stop.

.Under-rails Ellaresupported by bolts, 52r exattending .thruslots 53-inrlegs 5d of. the :table; and holes .in: the' rails.

hinge 55 at its end beneath guide rail 34; and:-is ;.-provided with; al-bolt-and thumb 1nut.55.on its opposite free end. The bolt 55 extends upward z-thru'ztable topdfi: and -::will'.move in an.arcuate slot 51 whichdsiormed-ona .radiusextending .from the. axis-ntpivot ofwhinge. -56. Cut-out: holes 59 enable the user to hold lumber piece 48 against t stop 5 Lbydnsertion of :the; users thumb :thru the 'shole nearest .the edge-of tthezlumber :which-is. op-

1 2 rosite: the-edge contacting the stop. The. saw. is.

. moved thruthe lumber, which-remains stationary. Figure.- lshovvs .the saw. and-the=table arranged for-.astraight or right angle cross cut. Figure 5 shows the :sawend table adjusted 'for anangle .or-miter cut. .in-aall operations-ibis to be .noted ..that the-saw: slides ontop otorabovethe object being cut. The lower segment. of=the blade does the. cutting: and. .is at-all: times directed downward. The lower guard, covering this segment, -.is .not disturbed,;but. covers. the; saw-the-same as when. the sawU-is-rused without the attachments shown. This. construction makes. 1189015 311 the safety-featureslinccrporatediin the saw frame.

It :is torbernotedrthat the guideflange 32- extends upward into the -..downwardly opening groove .33. .This construction makesit: unnecessary for the user to hold the frame 2-,1-shoe ,6, or guide, plate; -24.'down' orr therguide rail during a cutting operation. ..The-saw'is securely heldjin .the prearranged position relative. to the rail and cannot; jump out .of; position even- -if the saw shouldbecomecramped in the work or encounter senunsawable obstacle. The-preferred practice is -to.insert the guide flange 32 into the groove 33 at .the end of rail 34; as shown in Figure2. 'As the rshce. 5 moves over the top face of the work (such as door 44) or the top-face .of table top 46, the guidefianga 32;: while it: extends .up into groove 3.3; does notcontact .the bottom of 'the'groove. A slightelearance isaprovided between theseparts. If desired, the fit of theflange 32 within groove 33 maybe niadewitlr enough: clearance so that the guide-plateu'nnay beremoved'. byf'lifting 'the outer-"parent- -the sawtframe 2 "and 'swinging"it slightly toward the guide rail outer strip "31.

Stops5|- is supported by a Flange 32 may be thus swung or rotated outward from the guide rail groove. This means of removal requires positive direct effort, however, and since a cutting operation requires that the 5 shoe be made to slide on the face of the work, the flange could never be removed from the groove during cutting operation because the shoe is always pressed down on the face of the work.

use; in: addition toithef foregoing. explanation,it is to be-understood that'guideplate 24 is attached to the saw whenever it is set up for use, .*and may be removed by removal of bolts 22 when tit-is desired to-packthe saw away in a small space. -Theprovision of this detachable plate does not limit the uses of the saw for other purposes than those here described. With the plate in place, .and by: use=of..theguide rail, accurately guided cuts may be made either ripping the lumber .elengthwise, or cross-cutting lumber at any desired 2 angle.

. Lolaim:

1. Guide mechanism .:for power :drivenx hand held circularsaw, having bodies with shoes on the 2 bottom thereof, laterally disposed. saw blades,

25 composed. of. a; guide 1 plate! detachably secured :to

the saw body ShOflElOIlltSrSidE opposite-said saw blade, zhaving an upwardly turned guide ,fiange alongiitsrouteraedge; a: guide r-rail-composed-of a horizontally extendingbase: plate;- a :vertically exagtending: guide plate= attached theret ihaving a x downwardly opening guide groove. alongjitsupper I edge disposed to .recei-ve:said guide flange so that it will slide -.longitudinally: therealong; a =sawi,ng ztablehavinga' fiat mpg-attaching means securing .352 said. guide1rail-to=said tabletop adjacent to a -..-lateral edge thereof; underz-rails on'saidtable szsupporting. objectstto lie-sawed beneath saidtable top;.=and. a stop; attached .tosthe underside of said table top, hinged at onerend andsupported .to be 40vmcved1iman arcuatepath at the other end, for :.-pcsitioning objects toibe:sawedat various desired angles relativeto therdirectionlof cut ofxsaid saw asdeterminedby-said guide-rail.

2.-,.In' guide mechanism for a power driven hand 'held circular. saw-having a-body with' a-Shoe on Jthe bottomthereof, a laterally disposedsawblade, and guide mechanism-composed ofa guide plate detachably. secured ltothe saw bodyxshoe along -.-its.-isideopposite. said blade having an upwardly 5o 1 turned-guide .flangez along its outer edge, a guide r'railncomposed of; a horizontally extending base plate,.a verticallyextending guide: plate. attached .thereto, and. a downwardly? opening guide groove along its upper edgedisposedto receive said guide .fiangenso: ithat it will. slide tlongitudinallytstherealong, the combination therewith of a 1 sawing i tablehaving a rectangular flat top andzsupportring legsat; each corner, attaching means securing -said guide railzto 'said: table to adjacent a :lateral; edge thereof; so thatsaid saw blade will have a'cutting path parallel toand over-hanging said edge; under -rails attached to' said table legs and vertically adjustable "thereon .for supporting objects tome-sawed beneath said table top; and 55 a stop attachedto'the-under-side-of said table top hinged at one end adjacent the edge along which saidsaw travels and supported-to be moved in an arcuate path at the other end, for positioning obje'cts'tobe" sawed at desiredangles' relative to the cutting-path of said-saw.

3. In guide mechanism for a power driven hand held -circular saw=having abody with a shoe on the b'ottom thereof, a laterally disposed saw blade, and'guide'me'cha'nism composedof a guide plate detachably secured to the'saw body" shoe along its side opposite said blade having an upwardly turned guide flange along its outer edge, a guide rail composed of a horizontally extending base plate, a vertically extendin guide plate attached thereto, and a downwardly opening guide groove along its upper edge disposed to receive said guide flange so that it will slide longitudinally therealong; structure supporting said saw and guide rail composed of a sawing table having a rectangular flat top and supporting legs at each corner, attaching means securing said drive rail to said table top adjacent a lateral edge thereof so that said saw blade will travel in a cutting path parallel to said edge; under-rails removably attached to said table legs and vertically adjustable thereon for supporting objects to be sawed beneath said table top; and a stop swingacly attached to the under side of said table top at one end and removably attached at the other end to permit said other end to travel in an arcuate path, for positioning objects to be sawed at various angles relative to the said path of said References Qited in the file of this patent UNITED STATES ?ATENTS Number Name Date 1,537,734 Jacobs et a1. June 3, 1926 1,713,722 Waller May 21, 1929 1,788,255 Sherwin Jan. 6, 1931 1,911,045 Tinnen May 23, 1933 1,9805% McKay May 29, 1934 2,599,893 Butler June 10, 1952 2,634,767 Chappell Apr. 14, 1953 

